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Urine usually doesn't smell good, of course, not even a baby's urine. But if you notice a particularly foul odor from your baby's urine, you shouldn't ignore it.

Research done in Canada found that more than half the time, babies whose urine smelled bad had urinary tract infections.

Bad-smelling urine doesn't always indicate an infection. About a third of the time in the study, when a baby's urine smelled bad, no urinary tract infection was found.

But pediatricians say foul-smelling urine is usually not normal. Even if there is no UTI, the odor may indicate other health problems, so it's worth bringing it to your pediatrician's attention, particularly if your baby also has a fever.

It's also a good idea to bring a soiled diaper with you to the doctor's office, so the urine can be tested.